WO2006054805A1

WO2006054805A1 - Electrophotographic photosensitive body

Info

Publication number: WO2006054805A1
Application number: PCT/JP2005/021750
Authority: WO
Inventors: Katsumi Abe; Atsushi Takesue; Takehiro Nakajima; Makoto Koike; Shinya Nagai
Original assignee: Hodogaya Chemical Co., Ltd.
Priority date: 2004-11-22
Filing date: 2005-11-21
Publication date: 2006-05-26
Also published as: EP1816522A4; US20100291480A1; US20130266343A1; KR20130008637A; US8808951B2; EP1816522B1; TW201235802A; EP2485092A1; US7790342B2; JP2011164659A; CN102608881A; JP4809777B2; US20090226830A1; TWI385196B; CN101061437A; KR20070093968A; JP4880079B2; JPWO2006054805A1; TW200628512A; KR101245402B1

Abstract

Disclosed is an electrophotographic photosensitive body which is improved in electrophotographic characteristics such as sensitivity and residual potential, while having excellent durability. Specifically disclosed is an electrophotographic photosensitive body comprising a layer containing one or more specific p-terphenyl compounds and one or more polycarbonate resins represented by the following general formula (I). (I) The mass ratio between the p-terphenyl compounds and the polycarbonate resins contained in the layer is within the range from 2:8 to 7:3.

Description

Memo book Electrophotographic photoconductor Technical Field

The present invention relates to an electrophotographic photoreceptor. Specifically, the present invention relates to an electrophotographic photoreceptor having high sensitivity and excellent durability. Background art

Conventionally, inorganic photoconductive materials such as selenium, zinc oxide, cadmium sulfide, and silicon have been widely used for electrophotographic photoreceptors. These inorganic materials have many advantages and at the same time have various disadvantages. For example, selenium is difficult to produce, and has the disadvantage of being easily crystallized by heat or mechanical impact.Zinc oxide and sulfidizing power Demivum has problems with moisture resistance and mechanical strength, and dyes added as a sensitizer Deterioration of charging and exposure occurs due to the above, and there are drawbacks such as lack of durability. The conditions for manufacturing silicon are difficult, and because of the use of highly irritating gas, the cost is high, and it is sensitive to humidity. In addition, selenium and sulfidizing domium also have toxicity problems.

Organic photoreceptors using various organic compounds that have improved the disadvantages of these inorganic photoreceptors are widely used. Organic photoreceptors include single-layer photoreceptors in which a charge generator and a charge transport agent are dispersed in a binder resin, and stacked photoreceptors that are functionally separated into a charge generation layer and a charge transport layer. The feature of such photoconductors, which are called function-separated types, is that a material suitable for each function can be selected from a wide range, and a photoconductor having an arbitrary performance can be easily produced. It has been advanced. As described above, various improvements such as the development of new materials and combinations of these materials have been made in order to satisfy the basic performance and high durability requirements for electrophotographic photoreceptors. However, the current situation is that there is not enough.

As an example of the above, when various photoconductors are formed by changing the binder resin for a specific charge transfer agent, the type of binder resin affects the film physical properties and electrophotographic characteristics of the photoconductor. It is generally known to do. For example, when a photoconductor is produced using polystyrene resin as a binder resin for a stilbene-based charge transfer agent, the electrophotographic characteristics expressed by drift mobility and sensitivity are improved, but the film is conversely It becomes brittle and the film physical properties deteriorate. In addition, when a photoconductor is produced using acrylate resin as a binder resin, the film properties are improved, but the electrophotographic characteristics are deteriorated. Disclosure of the invention

The present inventors have intensively studied a photoconductor for electrophotography with high sensitivity and excellent durability, and found that an electrophotographic photoconductor containing a P-terphenyl compound and a polycarbonate resin has high sensitivity and durability. I found out that it was excellent. The object of the present invention is to provide an electrophotographic photosensitive member that has improved electrophotographic characteristics such as sensitivity and residual potential and also has excellent durability by combining a p-terphenyl compound and a polycarbonate resin. There is to do.

The present invention provides the following compounds (1) to (5) on a conductive support.

One or more p-terphenyl compounds selected from the group represented by the general formula (I) W

Four

(Wherein R 1 and R 2 may be the same or different and each represents a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group, and R 1 and R 2 together; R 3, R 4, R 5, R 6, R 7, R 8, R 9 and R 10 may be the same or different and may be a hydrogen atom, substituted or unsubstituted alkyl Represents a group, a substituted or unsubstituted aryl group or a hydrogen atom, p and q represent molar composition fractions (q includes 0), and the ratio of p and q is given by the formula 0 p≤2. Z is a satisfactory relationship, and Z is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms, a substituted or unsubstituted 4,4′-biphenylene group or a general formula (II)

R13 15

G CH ₂ CH ₂ 0- (-OCH2CH2-H

(II)

(Wherein R 1 1 and R 12 may be the same or different and each represents a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group, and R 1 1 and R 1 1 2 may form a ring together, R 1 3, R 14, R 15 and R 16 may be the same or different, a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted Or an unsubstituted aryl group or a divalent atom, and r represents an integer of 0 to 3.) ) Containing at least one of the polycarbonate resins represented by the following formula: Mass ratio of p-terphenyl compound and polycarbonate resin in the range of 2: 8 to 7: 3 The present invention relates to an electrophotographic photoreceptor having a layer. However, when only one polycarbonate resin is used, the structure of the polycarbonate resin represented by the general formula (I) is that R 1 and R 2 are methyl groups, and R 3, R 4, R 5, Except when R 6, R 7, R 8, R 9 and R 10 are hydrogen atoms and q is 0. By using the electrophotographic photoreceptor of the present invention, electrophotographic characteristics such as sensitivity and residual potential can be improved and high durability can be satisfied.

Specific examples of the polycarbonate resin represented by the general formula (I) include those represented by the following structural formula, but the polycarbonate resin used in the present invention is limited to these specific examples. It is not a thing. However, the case where the polycarbonate resin represented by the general formula (I) consists only of the polycarbonate resin represented by the structural formula (6) is excluded.

( twenty three ) oco4 O— CH ₂ CH ₂ CH ₂ CH ₂ — OCO

( twenty four )

The electrophotographic photoreceptor of the present invention contains one or more of p-terphenyl compounds selected from the compounds (D to Compound (5), and is further one kind of polycarbonate resin represented by the general formula (I) (However, the case where only the polycarbonate resin represented by the structural formula (6) is contained is excluded.) The photosensitive layer is included.

According to the present invention, by combining a p-terphenyl compound having a specific structure as a charge transporting agent and a polycarbonate resin having a specific structure as a binder resin, electrophotography such as sensitivity and residual potential is obtained. Characteristics It is possible to provide an electrophotographic photoreceptor that is improved and has excellent durability. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view showing the layer structure of a function-separated electrophotographic photoreceptor.

FIG. 2 is a schematic cross-sectional view showing the layer structure of a function-separated electrophotographic photoreceptor.

FIG. 3 is a schematic cross-sectional view showing the layer structure of a function-separated electrophotographic photoreceptor in which an undercoat layer is provided between the charge generation layer and the conductive support.

Fig. 4 is a schematic cross-sectional view showing the layer structure of a function-separated electrophotographic photoreceptor in which an undercoat layer is provided between the charge transport layer and the conductive support, and a protective layer is provided on the charge generation layer. It is.

Fig. 5 is a schematic cross section showing the layer structure of a functionally separated electrophotographic photoreceptor in which an undercoat layer is provided between the charge generation layer and the conductive support, and a protective layer is provided on the charge transport layer. FIG.

FIG. 6 is a schematic cross-sectional view showing the layer structure of a single-layer electrophotographic photoreceptor. FIG. 7 is a schematic cross-sectional view showing the layer structure of a single-layer electrophotographic photoreceptor in which an undercoat layer is provided between the photosensitive layer and the conductive support.

In addition, the code | symbol used in the figure represents the following, respectively.

1: Conductive support

2: Charge generation layer

3: Charge transport layer

4: Photosensitive layer

5: Undercoat layer

6: Charge transport ¾ Substance-containing layer

7: Charge generation material 8: Protective layer Best mode for carrying out the invention

There are various types of photosensitive layers, and any of them may be used as the photosensitive layer of the electrophotographic photoreceptor of the present invention. As representative examples, these photoconductors are shown in FIGS.

1 and 2 show a charge generation layer 2 containing a charge generation material as a main component on a conductive support 1, and a charge transport layer 3 containing a charge transport material and a binder resin as main components. A photosensitive layer 4 made of a laminate of the above is provided. At this time, as shown in FIG. 3, FIG. 4 and FIG. 5, the photosensitive layer 4 may be provided via an undercoat layer 5 for adjusting the charge provided on the conductive support. A protective layer 8 may be provided as the outermost layer. In the present invention, as shown in FIGS. 6 and 7, a conductive layer 4 is formed by dissolving or dispersing a charge generating material 7 in a layer 6 mainly composed of a charge transport material and a binder resin. It may be provided directly on the support 1 or via the undercoat layer 5.

The photoreceptor of the present invention can be produced according to a conventional method as follows. For example, one or more p-terfunil compounds selected from the compounds (1) to (5) and one or more polycarbonate resins represented by the general formula (I) are dissolved in a suitable solvent, If necessary, prepare a coating solution by adding charge generating substances, electron-withdrawing compounds or antioxidants, UV absorbers, light stabilizers, plasticizers, pigments, and other additives. A photosensitive member can be produced by applying this coating solution on a conductive support and drying it to form a photosensitive layer of several μm to several tens; im. In the case of a photosensitive layer comprising two layers, a charge generation layer and a charge transport layer, one or more p-phenyl compounds selected from the compounds (1) to (5) and the general formula (I) are used. Polycarbonate Charge generation layer with coating solution prepared by dissolving one or more types of resin in an appropriate solvent and adding antioxidant, UV absorber, light stabilizer, plasticizer, pigment, and other additives. It can be manufactured by forming a charge generation layer on a charge transport layer obtained by coating on a coating layer or by applying a coating solution. Further, the photoreceptor manufactured in this way may be provided with an undercoat layer and a protective layer as required.

The p-terphenyl compounds of the compounds (1) to (5) are, for example, 4, 4 "-Jordone p-terphenyl or 4,4" one-dib mouth-mapped p-terfurnyl and the corresponding amino compound such as Ullmann reaction. It can be synthesized by a condensation reaction. Corresponding amino compounds include, for example, condensation reactions such as the unoremann reaction of aminoindane with p--iodotozoleene or p-bromotonorene, the Ullmann reaction of the corresponding ananiline derivative with the corresponding oodobenzene derivative or the corresponding bromobenzene derivative, etc. It can be synthesized by the condensation reaction. Aminoindan can be synthesized, for example, by amination (for example, see Non-Patent Document 2) after indane halogenation (for example, see Non-Patent Document 1).

Non-Patent Document 1: Experimental Chemistry Course (4th Edition, Chemical Society of Japan) 1 9, 3 6 3 〜 4 8 2

Non-Patent Document 2: Laboratory Chemistry Course (4th Edition, The Chemical Society of Japan) 20, 2 7 9 to 3 1 8 pages

In the photoreceptor of the present invention, when a p-terphenyl compound and a polycarbonate resin are used, the mass ratio between them is 2: 8 to 7: 3. The preferred amount used is when the mass ratio of p-terphenyl compound to polycarbonate resin is 3: 7 to 6: 4.

As the conductive support on which the photosensitive layer of the present invention is formed, materials used in known electrophotographic photoreceptors can be used. Aluminum, Arminium Alloy, stainless steel, copper, dumbbell, vanadium, molybdenum, chromium, titanium, nickel, indium, metal drums such as gold and platinum, sheets or laminates, vapor deposits, or metal powders of these metals, carbon Conductivity is improved by including a conductive film such as black, copper iodide, or polymer electrolyte together with an appropriate binder and conducting a conductive treatment, such as plastic film, plastic drum, paper, paper tube, or conductive material. The attached plastic film or plastic drum can be used.

If necessary, an undercoat layer containing a resin or resin and a pigment may be provided between the conductive support and the photosensitive layer. The pigment dispersed in the undercoat layer may be a commonly used powder, but a white color with almost no absorption in the near infrared, or a color close to this, is desirable when considering high sensitivity. Examples of such pigments include metal oxides such as titanium oxide, zinc oxide, tin oxide, indium oxide, zirconium oxide, alumina, and silica. Less is desirable. In addition, as the resin used for the undercoat layer, a resin having a high solvent resistance with respect to a general organic solvent is desirable in consideration of applying a photosensitive layer thereon with a solvent. Examples of such resins include water-soluble resins such as polybutyl alcohol, casein, and sodium polyacrylate, alcohol-soluble resins such as copolymerized nylon and methoxymethylated nylon, polyurethane, melamine resin, and epoxy resin. Examples thereof include a hardened resin that forms a three-dimensional network structure.

The charge generation layer in the present invention comprises a charge generation agent, a binder resin, and additives that are added as necessary. Examples of the production method include a coating method, a vapor deposition method, and a CVD method. It is done.

Examples of charge generators include various crystalline forms of titanyl phthalocyanine, Cu— 回折 Diffraction angle in X-ray diffraction spectrum of α 2 0 ± 0. 2 ° Force 9.3, 1 0. 6, 1 3. 2, 1 5. 1, 2 0. 8, 2 3.3, 2 6 Titanyl phthalocyanine with a strong peak at 3, diffraction angle 2 0 ± 0. 2 ° is 7.5, 1 0. 3, 1 2. 6, 2 2. 5, 24. 3, 2 5. 4, 2 Titanyl phthalocyanine with a strong peak at 8.6, diffraction angle 2 0 ± 0.2. Titanyl phthalocyanine with strong peaks at 9.6, 2 4.1, 2 7.2, various crystalline forms of metal leaf phthalocyanine, such as vertical and X-type, copper phthalocyanine, aluminum phthalocyanine, zinc phthalocyanine, _α Phthalocyanine pigments such as Type 0, Type 0, Type IV oxotitanyl phthalocyanine, Cobalt phthalocyanine, Hydroxygallium phthalocyanine, Chrono-renolemine phthalocyanine, Chlorindium phthalocyanine. An azo pigment having a triphenylamine skeleton (for example, see Patent Document 1), an azo pigment having a strong rubazole skeleton (for example, see Patent Document 2), an azo pigment having a fluorene skeleton (for example, Patent Document 3) Azo pigments having an oxadiazole skeleton (for example, see Patent Document 4), azo pigments having a bisstilbene skeleton (for example, see Patent Document 5), and azo pigments having a dibenzothiophene skeleton (for example, Patent Documents) 6), azo pigments having a distyrylbenzene skeleton (see, for example, Patent Document 7), azo pigments having a distyrylcarbazole skeleton (see, for example, Patent Document 8), and azo pigments having a distyryloxadiazole skeleton. Zo pigments (for example, see Patent Document 9), azo pigments having a stilbene skeleton (for example, see Patent Document 10), Triazo pigments having a strong rubazole skeleton (see, for example, Patent Documents 11 to 12), azo pigments having an anthraquinone skeleton (see, for example, Patent Document 13), bisazo pigments having a diphenyl polyene skeleton (for example, Patents) Azo pigments such as literature 14 to 18). Perylene pigments such as perylene acid anhydride and perylene acid imide. Anthraquinone derivatives, anthanthrone derivatives, dibenzpi Polycyclic quinone pigments such as lenquinone derivatives, pyranthrone derivatives, violanthrone derivatives and isoviolanthrone derivatives. Diphenylmethane and triphenylmethane pigments. Cyanine and azomethine pigments; Examples include indigo pigments, bis-benzimidazole pigments, azurenium salts, pyrium salts, thiapyrylium salts, benzopyrylium salts, and squarylium salts. These may be used alone or in admixture of two or more as required.

Patent Document 1 ^: JP-A-5 3 ― 1 3 2 3 4 7

Patent Document 2 Japanese Patent Application Laid-Open No. 5 3-9 5 0 3 3

Patent Document 3-Japanese Patent Laid-Open No. 5 4-2 2 8 3 4

Patent Document 4 Japanese Patent Laid-Open No. 5 4 ― 1 2 7 4 2

Patent Document 5: Japanese Patent Laid-Open No. Sho 5 4-1 7 7 3 3

Patent Document 6 Japanese Patent Laid-Open No. 5 4 ― 2 1 7 2 8

Patent Document 7 JP-A-5 3 ― 1 3 3 4 4 5

Patent Document 8 Japanese Patent Laid-Open No. 5 4 1 1 7 7 3 4

Patent Document 9 Japanese Patent Application Laid-Open No. 5 4-2 1 2 9

Patent Document 10: Japanese Patent Application Laid-Open No. 5 3-1 3 8 2 2 9

Patent Document 11: Japanese Patent Application Laid-Open No. Sho 5 7-1 9 5 7 6 7

Patent Document 1 2: Japanese Patent Laid-Open No. Sho 5 7-1 9 5 7 6 8

Patent Document 13: Japanese Patent Application Laid-Open No. Sho 5 7 1 2 0 2 5 4 5.

Patent Document 14: Japanese Patent Application Laid-Open No. 5-9-1 2 9 8 5 7

Patent Document 15: Japanese Patent Laid-Open No. 6 2-2 6 7 3 6 3

Patent Document 16: JP-A-6 4-797

Patent Document 1 7: Japanese Patent Publication No. 3 ― 3 4 5 0 3

Patent Document 1 8: Japanese Patent Publication No. 4 ― 5 2 4 5 9

The binder resin is not particularly limited. For example, polycarbonate , Polyacrylate, Polyester, Polyamide, Polyethylene, Polystyrene, Polyacrylate, Polymethacrylate, Polyvinyl Butyral, Polyvinylenosetaceanol, Polyvinylenoformal , Polybutyl alcohol, polyacrylonitrile, polyacrylamide, styrene-acrylic copolymer, styrene monomaleic anhydride copolymer, acrylonitrile monobutadiene copolymer, polysulfone, polyethersulfone, There are silicon resin and phenoxy resin. These may be used alone or as a mixture of two or more as required.

Examples of additives used as necessary include antioxidants, ultraviolet absorbers, light stabilizers, dispersants, adhesives, and sensitizers. The film thickness of the charge generation layer manufactured using the material as described above is 0.1 to 2.0 μm, preferably 0.1 to 1.0 μm. The charge transport layer in the present invention is prepared by dissolving a charge transport agent, a binder resin, and, if necessary, an electron accepting material and an additive in a solvent, and then dissolving it in a charge generation layer or a conductive support, on an undercoat layer. After coating, it can be dried to form.

The solvent used is not particularly limited as long as it dissolves the charge transport agent, the binder resin, the electron accepting substance and the additive, and examples thereof include tetrahydrofuran, 1,4-dioxane, methinoreethino. Polar organic solvents such as leketone, cyclohexanone, acetonitrile, N, N-dimethylformamide, and ethyl acetate, aromatic organic solvents such as toluene, xylene, and black benzene, Chlorine hydrocarbon solvents such as low form, trichloroethylene, dichloromethane, 1,2-dichloroethane, and carbon tetrachloride can be used. These may be used alone or in admixture of two or more if necessary.

The photosensitive layer of the present invention can contain an electron accepting substance for the purpose of improving sensitivity, reducing residual potential, or reducing fatigue during repeated use. The Examples of such electron-accepting substances include succinic anhydride, maleic anhydride, dibromosuccinic anhydride, phthalic anhydride, tetrachlorophthalic anhydride, tetrabromophthalic anhydride, 3-2 Torophthalic anhydride, 4-12-to-phthalic anhydride, pyromellitic anhydride, methyl anhydride, tetracyanoethylene, tetracinoquinodimethane, o-dinitrobenzene, m-dinitrobenzene , 1, 3, 5 — Trinitrobenzene, p — Nitroben zonitryl, Piclinolec mouthlid, Kinonek mouth Louis mid, Chlorael, Bromanil, Dichlordisyano p — Benzoquinone, Anthraquinone, Dinitroanthraquinone, 2, 3—Dichloro-1,4 mononaphthoquinone, 1 1 2 troanthraquinone, 2 —clonal anthraquinone, phena Trenquinone, terephthalanol remarlenonitolyl, 9—ant linole merylidene remani trinore, 9—funoleorenilidene malononi trinore, poly nitro 1 9—funoleorenylidene malononi trinore, 4 —Nitrobensanodehydride, 9 —Benzolinoleanthracene, indandione, 3,5-dinitrobenzo'phenone, 4—black naphthalic anhydride, 3 —benzalphthalide, 3— (α —cyanol ρ —Nitrobenzanore) 1, 4, 5, 6, 7—Tetraclonal Phthalic Acid, Picric Acid, ο —Nittobenzoic Acid, ρ —Nittobenzoic Acid, 3,5-Ginitrobenzoic Acid, Pentafluoro Benzoic acid, 5-ditrosalicylic acid, 3,5-dinitrosalicylic acid, phthalic acid, methyl acid, and other compounds with high electron affinity .

Examples of additives used as necessary include antioxidants, ultraviolet absorbers, light stabilizers, plasticizers, quenchers, dispersants, and lubricants. Antioxidants include 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butyl-4-methoxyphenol, 2-tert-butyl alcohol, 4-methoxyphenol, 2, 4 —Dimethylolone 6 — tert-Butinolefenenore, Putinoleated Hydroxanisonole, Propionic acid Stearyl 1 β — (3, 5 — Di- tert-Ptyl 1 4-Hydroxyphenenole), α-Tocoferonole, J3— Tocopheronole, 2, 4 — Bi-Ion (n — Octylthio) 1 6— (4 —Hydroxy 1,3,5-Di-tert-butyl 2-lino) 1,1,3,5-Triazine, Octadecyl 3-— (3,5-Di-tert-Butyl 4-Hydroxy phenol Nore) propionate, 3, 5—G tert-Butinole 1-hydroxyl Benzenorefosphonate Tojetyl ester, 2,4-bis [(octylthio) methyl] 1 o-Crezore, i Sooctinore 3 — (3,5-G-tert-butynole 1-hydroxyphenyl) Monophenol compounds such as propionate. Triethyleneglycol-bis [3- (3-tert-butyl-5-methinoleyl 4-hydroxyphenyl) propionate], 1,6-hexanediol bis [3- (3,5-di-tert-butyl) 4-Hydroxyphenyl) propionate], Pentaerythritolite trakis [3 (5,5-di-tert-butynole 4-Hydroxyphenyl) propionate], 2,2-diethylene Bis [3— (3,5-Di-tert-butynole 4-hydroxyoxyphenol) propionate], N, N 'Hexamethylenebis (3,5-di-tert-butyl 4-hydroxy) Drosinamide), 1,3,5-trimethyl-1,2,4,6-tris (3,5-ditert-ptynolyl-4-hydroxybenzinole) benzene, tris. (3, 5-di-tert-butyl 4-4- (Droxybenzyl) monoiso cyanate, 2, 2-thiobis (4-methyl-6-tert-butylphenol), 2, 2, monomethylenebis (6-tert-butyl-1-methylphenol), 4,4'-butylidene bis-bis (3-methyl-1-6-tert-butylphenol), 4,4'-thiobis (6-tert-butinoyl 3-methinolephenol), 1, 1, 3— Tris (2-Methyl-1-4-Hydroxy 5— tert-Butinolephenol) Polyphenols such as butane Examples of such compounds. These monophenolic compounds and polyphenolic compounds may be used alone or in admixture of two or more. Moreover, you may mix and use an ultraviolet absorber or a light stabilizer. UV absorbers include 2 — (5 —methyl-2-hydroxyphenyl) benzotriazole, 2 — [2 —hydroxyl 3,5 —bis (a, a-dimethylbenzyl) phenyl] benzotriazole , 2— (3, 5 — Di tert — Butinole 1 2- Hydroxyphne Nore) Benzotriazolene, 2 — (3 — tert — Butinore 5 — Metinore 2—Hydroxyphene 2) Benzotriazole, 2 — (3, 5—Di tert — Petit Nore 1—Hydroxyphenenole) 1 5 — Closed Benzo Triazol, 2— (3, 5 — Di tert 1 Amylou 2 —Hydroxyphenenole) Benzotriazolone, 2— (2 —Hydroxyl 1) —Tert —Octylfenenole) Benzotriazole, 2 — [2 —Hydroxy 1 3 — (3, 4, 5, 6 — Te Trahi Droft Benztriazole compounds such as 1-methylphenyl]. 2—Hydroxy _ 4-methoxybenzophenone, 2—Hydroxy 4—n—Octoxybenzophenone, 2, 2, 4, 4, 4 ′ —Tetrahydroxybenzophenone, 2, 4-dihydroxybenzophenone, 2,2'-dihydroxyl 4,4'-dimethoxybenzophenone, 2,2, -dihydroxy-4-methoxybenzophenone, 2-hydroxyl 4-octade Benzophenone compounds such as siloxybenzophenone and 4-dodecyloxy-2-hydroxybenzophenone. Commercially available benzoate compounds, cyanoacrylate compounds, oxalic acid amide compounds, triazine compounds and the like are also preferably used. These ultraviolet absorbers may be used alone or in combination of two or more. Further, it may be used by mixing with a light stabilizer or an antioxidant. Light stabilizers include dimethyl succinate · 1-(2-hydroxychetyl)-4-hydroxyl 2, 2, 6, 6-tetramethylpiperidine polycondensate, poly 6-(1, 1 , 3,3-Tetramethylbutyl) amino 1,3,5-triazine 1,2,4] [(2,2,6,6-tetramethyl-4-piperidyl) imino] hexamethylene [ (2, 2, 6, 6-tetramethyl-4-piperidyl) imino]}, N, N, bis (3-aminopropinole) ethylenediamine 2,4-bis [N-butinole 1-N- (1,2,2,2,6,6-pentamethinole 4-piperidinole) amino] — 6-chloro 1, 3,5-triazine condensate, bis (2,2,6 , 6-tetramethyl-4-piperidyl) sebacate, bis (1, 2, 2, 6, 6, 6_pentamethyl — 4-piperidinyl) sebacate, 2— (3, '5-Didi tert-Butinoleol 4-Hydroxybenzenole) 2-N-Butinoremalonate Bis (1,2,2,6,6-Pentamethyl-1-4-Piperidyl) Hindered and dominated compounds such as These light stabilizers may be used alone or in combination of two or more. Further, it may be used as a mixture with an ultraviolet absorber or an antioxidant.

As an additive, a compound having the functions of an antioxidant and an ultraviolet absorber may be added in one molecule. Specifically, 6- (2-Benzotriazolyl) 1 4-1 tert-Pintonol 6'-tert-Butyl 4'-Methinore 2,2'-Methylenebisphenol, 6- (2- 1) tert-butyl 1 4 ', 6' — di-tert-butyl 1 2, 2, -methylenebisphenol, 6— (2-benzotriazolinol) 1-tert-Pintonole 4 ', 6, 1-di tert-amino 1,2-2'-Methylenebisphenol, 6- (2-benzotriazolyl) 1 4- ert-butynole 4, 4, 6, 1 tert—Otatinole 2, 2, 1 methylene bisphenol, 6— (2-benzotriazolinole)-4-te rt 1 octatinole 6 '-tert -butinore 4, -methinore 2, 2, 1 methylenebisphenol, 6 — (2 -benzotriazolyl) 1 4-tert —octyl 1, 4, 6' —di 1 tert butylinore 1, 2, 1-methylbisphenol, 6- (2-benzotriazolyl) 4-41 tert-octinole 4 ', 6'-di-tert-amino 1,2-methylene bisphenol, 6- (2— Benzotriazolinol) 1 4-tert-octinole 1, 4, 6, di-di tert-octinore 2, 2, 1-methylene bisphenol, 6 — (2-benzotriazolyl) 1-4 methyl 1 6, -tert —Butinore 4, 1 Metinore 2, 2 '-Methylenebisphenolate, 6-(2 —Benzotriazolinole) 1 4 —Metinore 4', 6 '—Di tert -Butyl 2, 2, – Methylenebisphenol Nore, 6 — (2-Benzotriazol) 1 4-Methinore 1, 6, 6 '— Di tert — Aminole 2, 2'-Methylenebisphenol, 6 — (2-Benzotriazolyl) ) 1-methylol 4 ', 6, tert-octinol 1, 2'-methylenebisphenol norole and other benzotriazol-anololylene bisphenol-nole compounds It is done. These compounds may be used alone or in combination of two or more. It can also be used in combination with UV absorbers or antioxidants. ,

Further, the photosensitive layer of the present invention may contain a known plasticizer for the purpose of improving the film formability, flexibility, and mechanical strength. As the plasticizer, for example, phthalic acid ester, phosphoric acid ester, chlorinated paraffin, methyl naphthalene, epoxy compound, chlorinated fatty acid ester and the like can be used.

A surface protective layer may be provided on the surface of the photoreceptor as necessary. As materials to be used, resins such as polyester and polyamide, and metals and metal oxides that can control electric resistance are mixed with these resins. You can also. The surface protective layer is preferably as transparent as possible in the light absorption wavelength region of the charge generating agent. EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples. The part in an Example represents a mass part and% represents weight%. Example 1

[Synthesis Example 1 (Synthesis of Compound (1))]

P-trinoreamin 1 1.5 g (0. O 6 3 mol), 4, 4, one-joule ρ-terfeninole 1 4.5 g (0. O 3 0 mol) Non-aqueous potassium carbonate 5.0 g (0. 0 3 6 mol), copper powder 0.38 g (0. 0 0 6 mo 1), n—dodecane 15 m 1, and nitrogen gas While being introduced, the mixture was heated to 2100-210 ° C and stirred for 30 hours. After completion of the reaction, the reaction product was extracted with toluene 40 O m 1, the insoluble matter was removed by filtration, and the filtrate was concentrated to dryness. The resulting solid was purified by column chromatography (carrier; silica gel, eluent; toluene: hexane = 1: 4), and N, N'-diphenylenyl N, N'-di-p-tolyl. 1,4,4 "-diaminol !! 13.6 g of 1-terphenyl (compound (1)) (yield; 76.4%, melting point; 1 6 7. 2 ~: L 68.2 ° C) Obtained.

Compound (1) was identified by elemental analysis and IR measurement. The elemental analysis values are as follows. Carbon: 8 9. 2 3% (8 9. 1 5%), Hydrogen: 6. 14% (6.1 2%), Nitrogen: 4. 60% (4.7 3%) (calculated value (Indicated in parentheses.) Example 2 [Synthesis Example 2 (Synthesis of Compound (2))]

(4-Methoxy-2-methylphenyl) phenylamine 1 4.1 g (0. 0 6 6 mo 1), 4, 4 "one-joule p — terfeninore 1 4.5 g (0. 0 3 0 mo 1) , Anhydrous potassium carbonate 5.0 g (0. 0 3 6 mo 1) _s Copper powder 0.38 g (0. 0 0 6 mo 1), n-dodecane 15 ml are mixed, and nitrogen gas is introduced The mixture was heated to 20 ° C. to 2100 ° C. and stirred for 30 hours After the completion of the reaction, the reaction product was extracted with toluene 400 ml, and the insoluble matter was removed by filtration. The resulting solid was purified by column chromatography ^ "(carrier: silica gel, eluent; toluene: hexane = 1: 2), and N, N ' 1-0.7 g (yield; 80.0%, melting point; 1 8 0) of N, Ν '-diphenyl 4-, 4 "-diamino-p-terphenyl (compound (2)) 8 to 1 8 3.4 ° C).

The compound (2) was identified by elemental analysis and IR measurement. The elemental analysis values are as follows. Carbon: 84.67% (84.63%), hydrogen: 6.23% (6.18% '), nitrogen: 4.26% (4.29%) (calculated value) Is shown in parentheses.) Example 3

[Synthesis Example 3 (Synthesis of Compound (3))]

5 —Aminoindane (manufactured by Tokyo Chemical Industry Co., Ltd.) 3 3.3 g (0.25 mo 1) was dissolved in glacial acetic acid 25 50 m 1 and heated to 50 ° C to give acetic anhydride 5 1.0 g (0.5 mo 1) was added dropwise. After completion of dropping, the mixture was stirred for 4 hours. After completion of the reaction, the reaction solution was poured into 1500 ml of ice water with stirring. The precipitated crystals were separated by filtration and washed with 100 ml of water. The crystals obtained were dried to give 5 1 (N-acetylamino) indane 37.06 g (yield; 84.6%, Melting point: 10 0. 5 to 1 0 3.5 ° C).

5 1 (N-acetylamino) Indane 2 6. 2 8 g (0.15 mol), p-odotoluene 4 3.6 1 g (0.20 mol), anhydrous potassium carbonate 2 5.8 8 g (0. l 8 8 mol) and copper powder 2. 38 g (0.0 3 8 mo 1) were mixed, heated to 200 ° C. while introducing nitrogen gas, and stirred for 6 hours. After the completion of the reaction, the mixture was cooled, added with 22.3 g of lithium hydroxide power dissolved in 20 ml of water and 50 ml of isoamyl alcohol, and hydrolyzed at 1300 ° C for 2 hours. went. After completion of the hydrolysis, 2500 ml of water was added and isoamyl alcohol was removed by azeotropic distillation, and then 200 ml of toluene was added to dissolve the reaction product. After filtration, it was dehydrated with magnesium sulfate. After the magnesium sulfate is filtered off, the filtrate is concentrated and purified by column chromatography (carrier: Siri-Force gel, eluent; toluene: hexane = 1: 4). I got 3 2.3.

Indan 5—Inole p—Trinoreamin 1 8. 1 g (0. 0 8 1 mo 1), 4, 4 ”—Jordeau p—Turphenyl 1 8. 9 g (0. 0 3 9 mo 1 ), Anhydrous carbonated lithium 7.2 g (0. 0 5 2 mo 1) Copper powder 0.76 g (0. 0 1 2 mo 1) _x n and dodecane 30 ml are mixed, and nitrogen gas is added. While being introduced, the mixture was heated to 20 ° C. to 20 ° C. and stirred for 30 hours.After the reaction was completed, the reaction product was extracted with toluene 400 ml, and the insoluble matter was removed by filtration. The resulting solid was purified by column chromatography (carrier; silli-force gel, eluent; toluene: hexane = 1: 4), and N, N'-bisindane 1 9.9 g (yield; 7 5.7%, melting point; 2 0 7) of N, N'-di-p-tolyl-l, 4 "-diamino-p-terphenyl (compound (3)) 4-2 0 8.1 ° C).

The compound (3) was identified by elemental analysis and IR measurement. The elemental analysis values are as follows. Carbon: 8 9. 1 3% (8 9. 2 5%), Hydrogen: 6.6 3% (6.59%), Nitrogen: 4.2 4% (4.16%) (calculated values are shown in parentheses) Example 4

[Photoreceptor Example 1]

One part of an alcohol-soluble polyamide (Amilan CM—400, manufactured by Toray) was dissolved in 13 parts of methanol. To this was added 5 parts of titanium oxide (Taipeku CR 1 EL, manufactured by Ishihara Sangyo) and dispersed for 8 hours with a paint shaker to prepare a coating solution for the undercoat layer. It was applied and dried using a wire bar to form an undercoat layer having a thickness of 1 μπι.

Next, the following titanyl phthalocyanine (charge generation) where the diffraction angle 2 Θ ± 0.2 ° in the X-ray diffraction spectrum of Cu u Κ α has strong peaks at 9.6, 2 4.1, and 2 7.2. Agent No. 1)

1. 5 parts were added to 50 parts of a 3% hexane solution of polyvinyl petital resin (S-LEC BLS, manufactured by Sekisui Chemical Co., Ltd.) and dispersed with an ultrasonic disperser for 1 hour. The obtained dispersion was applied on the undercoat layer using a wire bar, and then dried at 110 ° C. for 1 hour under normal pressure to form a charge generation layer having a thickness of 0.6 μm.

On the other hand, the p-terphenyl compound (electric Cargo transport agent No. 3) 1 0 0 part of the following polycarbonate resin (Polynate resin No. 1)

In addition to 2 parts of 13.0% tetrahydrofuran solution of 93.0%, ultrasonic waves were applied to completely dissolve the p-terphenyl compound. This solution was applied onto the above-described charge generation layer with a wire bar and dried at 110 ° C. under normal pressure for 30 minutes to form a charge transport layer having a film thickness of 20 μπι to produce a photoreceptor. Example 5

[Photoreceptor Example 2]

A photoconductor was prepared in the same manner as in Example 4 except that the following polycarbonate resin (polycarbonate resin Νο.2) was used instead of polycarbonate resin Νο.1 in Example 4.

Example 6

[Photoreceptor Example 3]

Instead of using the charge generating agent No. 1 in Example 4, the diffraction angle in the X-ray diffraction spectrum of Cu— C α 2 0 ± 0.2 ° force S 7.5, 1 0. 3, 1 2 6, 2 2.5, 2 4. 3, 2 5. 4 and 2 8. 6 instead of using titanyl phthalocyanine (charge generating agent No. 2), which has a strong peak, using the charge transport agent No. 3 P-terphenyl compound (2) of the compound (2) A photoconductor was prepared in the same manner as in Example 4 except that the cargo transport agent No. 2) was used. Example 7

[Photoreceptor Example 4]

A photoconductor was prepared in the same manner as in Example 6 except that the polycarbonate resin No. 2 was used instead of the polycarbonate resin No. 1 in Example 6. Example 8

[Photoreceptor Example 5]

In Example 4, instead of using the charge generating agent N o. 1, the diffraction angle in the X-ray diffraction spectrum of Cu—Ka is 20 ± 0.2. Force S9.3, 10.6, 13.2, 15.1, 20.8, 23.3, 26.3, titanyl phthalocyanine (charge generator No. 3 ) For the compound (1) instead of using the charge transport agent No 2. ) A photoconductor was prepared in the same manner as in Example 4 except that a terphenyl compound (charge transport agent No. 1) was used. Example 9

[Photoreceptor Example 6]

A photoconductor was prepared in the same manner as in Example 8 except that the polycarbonate resin No. 2 was used instead of the polycarbonate resin No. 1 in Example 8. Example 1 0 [Photoreceptor Example 7]

Alcohol-soluble polyamide (Amilan CM—800, manufactured by Toray Industries) 10 parts dissolved in 190 parts of methanol, and then coated on an aluminum surface of an aluminum vapor-deposited PET film using a wire bar and dried. A 1 μm <D undercoat layer was formed.

Next, as a charge generator, the following metal leaf leaf talocyanine (charge generator No. 4)

1.5 parts were added to 50 parts of a 3% cyclohexanone solution of polyvinyl petital resin (S-LEC BLS, manufactured by Sekisui Chemical Co., Ltd.) and dispersed with an ultrasonic disperser for 1 hour. The obtained dispersion was applied on the undercoat layer using a wire bar, and then dried at 110 ° C. for 1 hour under normal pressure to form a charge generation layer having a thickness of 0.6 μm.

— On the other hand, charge transport agent No. 1, 100 parts as charge transport agent is added to 2 part of 13.0% tetrahydrofuran solution of polycarbonate resin No. -The terphenyl compound was completely dissolved. This solution was applied onto the above-described charge generation layer with a wire bar and dried at 110 ° C. under normal pressure for 30 minutes to form a charge transport layer having a film thickness of 20 μιη to produce a photoreceptor. Example 1 1

[Photoreceptor Example 8]

Instead of using polycarbonate resin Ν ο .1 in Example 10 A photoconductor was prepared in the same manner as in Example 10 except that the polycarbonate resin No. 2 was used. Example 1 2

[Photoreceptor Example 9]

A photoconductor was prepared in the same manner as in Example 6 except that instead of using the charge transfer agent No. 2 in Example 6, the charge transfer agent No. 1 was used. Example 1 3

[Photoreceptor Example 1 0]

Instead of using the polycarbonate resin No. 1 in Example 1 2, an 8: 2 mass ratio mixture of the polycarbonate resin No. 2 and the following polycarbonate resin (polycarbonate resin No. 3) was used. A photoconductor was prepared in the same manner as in Example 12.

Example 1 4

[Photoreceptor Example 1 1]

A photoconductor was prepared in the same manner as in Example 4 except that the following polycarbonate resin (polycarbonate resin No. 4) was used instead of the polycarbonate resin No. 1 in Example 4.

Example 1 5

[Photoreceptor Example 1 2]

A photoconductor was prepared in the same manner as in Example 4 except that the following polycarbonate resin (polycarbonate resin No. 5) was used instead of the polycarbonate resin No. 1 in Example 4.

Example 1 6

[Photoreceptor Example 1 3]

A photoconductor was prepared in the same manner as in Example 4 except that the following polycarbonate resin (polycarbonate resin No. 6) was used instead of the polycarbonate resin No. 1 in Example 4.

Example 1 7

[Photoreceptor Example 1 4]

Instead of using the charge transfer agent No. 2 in Example 6, a 9: 1 mass ratio mixture of the charge transfer agent No. 3 and the p-terphenyl compound (charge transfer agent No. 4) of compound (4) A photoconductor was prepared in the same manner as in Example 6 except that was used. Example 1 8

[Photoreceptor Example 1 5]

A photoconductor was prepared in the same manner as in Example 17 except that polycarbonate resin No. 2 was used instead of polycarbonate resin No. 1 in Example 17. Example 1 9

[Photoreceptor Example 1 6]

Bisazo pigments as charge generators (charge generators N o 5)

1. Add 0 parts and 5% cyclohexanone solution of polyvinyl butyral resin (S-REC BL-S, manufactured by Sekisui Chemical Co., Ltd.) 8.6 parts to cyclohexanone 8 3 parts and grind in a ball mill The dispersion process was performed for 48 hours. The obtained dispersion was applied and dried on the aluminum surface of an aluminum vapor-deposited PET film as a conductive support using a wire bar to form a charge generation layer having a thickness of 0.

On the other hand, the charge transport agent No. 1, 100 parts as a charge transport agent is added to 16.3% tetrahydrofuran solution of polycarbonate resin No. The phenyl compound was completely dissolved. This solution was applied onto the above-described charge generation layer with a wire bar and dried at 10 ° C. under normal pressure for 30 minutes to form a charge transport layer having a thickness of 20 IX m, thereby preparing a photoreceptor. Example 2 0

[Photoreceptor Example 1 7]

A photoconductor was prepared in the same manner as in Example 19 except that the following bisazo pigment (charge generator No. 6) was used instead of the charge generator No. 5 in Example 19.

Example 2 1

[Photoreceptor Example 1 8]

The following bisazo pigments (charge generators N o.

1. Add 8 parts of polyester resin (Byron 200, manufactured by Toyobo Co., Ltd.) 8% and 6 parts of 5% Tetrahydrofuran solution to 3 parts of Tetrahydrofuran 8 and pulverize and disperse with a ball mill. Went for hours. The obtained dispersion was applied and dried on the aluminum surface of an aluminum vapor-deposited PET film as a conductive support using a wire bar to form a charge generation layer having a thickness of 0.8 / X m.

-On the other hand, charge transfer agent No. 3, 100 parts as a charge transfer agent is added to 2 parts of 13.0% tetrahydrofuran solution of polycarbonate resin No. 2, and ultrasonic waves are applied. Thus, the p-terphenyl compound was completely dissolved. This solution was applied onto the above-described charge generation layer with a wire bar and dried at 110 ° C. under normal pressure for 30 minutes to form a charge transport layer having a thickness of 20 / xm, thereby preparing a photoreceptor. [Comparative Example 1]

A photoconductor was prepared in the same manner as in Example 4 except that the polycarbonate resin No. 3 was used instead of the polycarbonate resin No. 1 in Example 4.

[Comparative Example 2]

A photoconductor was prepared in the same manner as in Example 10 except that polycarbonate resin No. 3 was used instead of polycarbonate resin No. 1 in Example 10.

[Comparative Example 3]

A photoconductor was prepared in the same manner as in Example 12 except that polycarbonate resin No. 3 was used instead of polycarbonate resin No. 1 in Example 12.

[Comparative Example 4]

A photoconductor was prepared in the same manner as in Example 17 except that polycarbonate resin No. 3 was used instead of polycarbonate resin No. 1 in Example 17.

[Comparative Example 5]

A photoconductor was prepared in the same manner as in Example 21 except that polycarbonate resin No. 3 was used instead of polycarbonate resin No. 2 in Example 21. Example 2 2

The photoconductors prepared in Examples 4 to 18 and Comparative Examples 1 to 4 were evaluated for electrophotographic characteristics using an electrostatic copying paper test apparatus (trade name “EPA-8100”). First, the photoconductor was corona-discharged at 6.5 kV at a certain place, and the charging potential V0 at this time was measured. Next, exposure was carried out with 780 _nm monochromatic light of 1.0 μWZ cm 2, and a half-exposure amount E 1/2 (μ J / cm 2) was determined. Next, this photoconductor was worn by a rotary ablation tester manufactured by Toyo Seiki Co., Ltd. for 1,500 rotations using a wear wheel CS-10. The results are shown in Table 1.

table 1

Example

Charge generation Charge transport Holy silicate resin V0 Vr El / 2 Wear amount agent

Extension agent.

N 0. (-V) (-V) (μ J / cra ² )

N o. (Mg)

N o.

Comparative example

Example 4 1 3 1 742 0 0. 25 4 Example 5 1 3 2 719 0 0. 27 8 Example 6 2 2 1 638 1 0. 36 6 Example 7 2 2 2 613 3 0. 39 8 Example 8 3 1 1 727 1 0. 32 5 Example 9 3 1 2 705 1 0. 37 8 Example 1 0 4 1 1 720 13 0. 56 4 Example 1 1 4 1 2 707 15 0. 59 8 Example 1 2 2 1 1 640 1 0. 32 4 Example 1 3 2 1 2, 3 615 2 0. 35 9 Example 1 4 1 3 4 710 0 0. 27 5 Example 1 5 1 3 5 722 0 0.27 5 Example 1 6 1 3 6 719 0 0. 28 5 Example 1 7 2 3, 4 1 626 2 0. 32 5 Example 1 8 2 3, 4 2 601 2 0. 34 8 Comparative Example 1 1 3 3 560 40 0. 78 24 Comparative Example 2 4 1 3 648 28 0. 82 21 Comparative Example 3 2 1 3 451 48 1. 03 25 Comparative Example 4 2 3, 4 3 454 51 0.98 24

Example 2 3

Example 1 The photoconductors prepared in 9 to 21 and Comparative Example 5 were evaluated for electrophotographic characteristics using an electrostatic copying paper test apparatus (trade name “E P A— 8 10 0 0”). First, the photoconductor was subjected to a corona discharge of 6.0 kV at a certain place, and the charging potential V0 at this time was measured. Next, exposure was performed with white light of 1.0 L u X, and a half-exposure amount E 1/2 (L u x · sec) was determined. Next, this photoconductor was worn by a rotary ablation tester manufactured by Toyo Seiki Co., Ltd. using a wear ring CS-1 0 for 15 0 0 rotations. The results are shown in Table 2. Table 2

As described above, according to the present invention, electrons such as sensitivity and residual potential can be obtained by combining a p-tert-phenyl compound having a specific structure as a charge transport agent and a polycarbonate resin having a specific structure as a binder resin. An electrophotographic photoreceptor having improved photographic characteristics and excellent durability can be provided. Although the invention has been described in detail and with reference to specific embodiments, various changes and modifications can be made without departing from the spirit and scope of the invention. This will be apparent to those skilled in the art.

This application is based on a Japanese patent application (Japanese Patent Application No. 2004-337169) filed on January 22, 2004, the contents of which are incorporated herein by reference. Industrial applicability

The present invention is useful as an electrophotographic photoreceptor capable of satisfying electrophotographic characteristics and realizing high sensitivity and high durability.

Claims

The following compounds (1) to (5) on the conductive support

Α

No ^ box

(Four)

At least one p-terphenyl compound selected from the group consisting of:

(Wherein R 1 and R 2 may be the same or different and each represents a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group, and R 1 and R 2 together; R 3, R 4, R 5, R 6, R 7, R 8, R 9 and R 10 may be the same or different and may be a hydrogen atom, substituted or unsubstituted alkyl Represents a group, a substituted or unsubstituted aryl group, or a hydrogen atom, p and q represent molar composition fractions (q includes 0), and the ratio of p and q satisfies the formula 0 q Z p≤ 2 Z is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms, a substituted or unsubstituted 4,4′-biphenylene group or a general formula (II)

(In the formula, R 1 1 and R 12 may be the same or different and each represents a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group. R 1 1 and R 12 may be combined to form a ring, and R 1 3, R 14, R 15 and R 16 may be the same or different and may be a hydrogen atom, substituted or absent. A substituted alkyl group, a substituted or unsubstituted aryl group, or a halogen atom is represented, and r represents an integer of 0 to 3. Represents a divalent group represented by 1) A photoconductor for electrophotography having a layer containing at least one of the polycarbonate resins represented by the formula (2) in a mass ratio of p-terfenyl compound and polycarbonate resin in the range of 2: 8 to 7: 3. When only one type of polycarbonate resin is used, the structure of the polycarbonate resin represented by the general formula (I) is that R 1 and R 2 are methyl groups, and R 3, R 4, R 5, R 6, R Except when 7, R 8, R 9 and R 10 are hydrogen atoms and q is 0.

2. The polycarbonate resin represented by the general formula (I) comprises at least one polycarbonate resin represented by any one of the following structural formulas (6) to (28). Photoconductor for electrophotography, except for the case consisting only of polycarbonate resin represented by structural formula (6).

(7)

Ten

(1 5)

( twenty two)

3. One or more p-terphenyl compounds selected from compounds (1) to (5) and one or more polycarbonate resins represented by the general formula (I) are mixed with p-terphenyl. 3. The electron according to claim 1, comprising a compound and a polycarbonate resin in a mass ratio of 3: 7 to 6: 4. Photoconductor for photography.